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Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2023
Summary of Significant Accounting Policies |
Schedule of activity in allowance of credit losses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | Nine Months Ended September 30,
(Thousands) |  | 2023 |  | 2022 |  | 2023 |  | 2022
Balance at beginning of period | ​ | $ | 2,672 | ​ | $ | 2,392 | ​ | $ | 3,023 | ​ | $ | 3,749
Charged to selling, general and administrative expense | ​ | ​ | 629 | ​ | ​ | 364 | ​ | ​ | 278 | ​ | ​ | 1,286
Write-offs | ​ | ​ | — | ​ | ​ | (9) | ​ | ​ | — | ​ | ​ | (2,288)
Total | ​ | $ | 3,301 | ​ | $ | 2,747 | ​ | $ | 3,301 | ​ | $ | 2,747
Schedule of contractual obligation | ​
​ | ​ | ​ | ​
(Thousands) |  | September 30, 2023
Confirmed obligations outstanding at the beginning of the year | ​ | $ | —
Invoices confirmed during the year | ​ | ​ | 69,787
Confirmed invoices paid during the year | ​ | ​ | (2,321)
Confirmed obligations outstanding at the end of the quarter | ​ | $ | 67,466

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- Definition Tabular disclosure of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
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